boXem A series

[boXem]

I will do so when some I find some time. Only two resistors are slightly changed, so the FFT will look strictly the same. Amplified upstream noise will increase by the gain increase, so SINAD will decrease by the same value.
Both Arthur 4216/E2 and A 4216/E2 have a gain of 20.3/26.3 dB

 

[boXem]

Following customer requests, three new part numbers appear to the catalog:
boXem A 4216/E1 1ET6525SA monoblock
boXem A 4216/E2 King Size 1ET6525SA stereo in the full size case
boXem A 4216/E2M 1ET6525SA dual mono

 

[boXem]

No such plan at the moment.

 

[rsg]

Is there an on-line manual for the boXem A 4216 series amplifiers?

 

[boXem]

It's not finished, I need to generate the pictures.

 

[David_M]

Hey Fred ... I was looking at your site for detailed technical specs of your new 2nd Eigenkart amplifiers and could not find anything meaningful. A spec saying <0.001% is not that useful these days. Are you able to provide more detailed specs, comparable to what see here on ASR?

 

[boXem]

Previous page shows a nice SINAD measurement

In a world of module datasheets or made up data I'm not really motivated to spend time to publish accurate specs

 

[David_M]

Previous page shows a nice SINAD measurement

In a world of module datasheets or made up data I'm not really motivated to spend time to publish accurate specs

Thank you. My real interest is in the 5523/E1 (9040BA-based amplifier). Can we get some specs on this amplifier as well?

1. Also, what are the chances of updating your website with these specs?
2. What do you think of Marchaudio's method of spec'ing THDN specs of its amplifiers?

... and btw, I really hope that last bit was satire!

 

[Stinga]

Dear Mr Boxem, any plans for a 3 channel 9040 version? If not is it feasible in the a series enclosure with your std power supply?
Thanks man
Al

 

[boXem]

Dear Mr Boxem, any plans for a 3 channel 9040 version? If not is it feasible in the a series enclosure with your std power supply?
Thanks man
Al

Dear Al, unfortunately no such plan. It would require a new buffer board and 3 x SMPS1200 that would probably cause a lot of EMI issues. You better invest in 3 x Arthur 5523/E1
Regards
Fred

 

[Stinga]

Ha, nice one, would love to but chasing a 1 box solution. If I am correct the smps3k would still deliver around 80% rated power of the 9040 modules?? which is still truck loads...
If that is roughly right what would be involved in the buffer board ie would you customise one for me easily?
Are you interested?
Al

 

[boXem]

The SMPS3k is unfortunately not available with the 45V rails needed for the 9040. If you really need a lot of power and want a single box, better wait for the NCx1000, there are better chances to find it in the A series than the 9040.

 

[Stereoed]

Hello, I am interested in the Purifi 7040 amplifier. Either as a monoblock or alternatively as a stereo amplifier with real double mono. Most suppliers use the SMPS1200 400 power supply. However, this power supply cannot supply the 7040 with sufficient power, as this power supply only supplies 65 volts. There are actually suppliers who build stereo amplifiers with this power supply, but only use one power supply. The manufacturer Boxem offers mono as well as stereo amplifiers in double mono. However, the Boxem homepage only says that the SMPS1200 power supply is installed. But unfortunately it does not specify which version. Is this the 65 volt version or a more powerful version?

Who can recommend products here that can supply enough power for the 7040 module?

 

[boXem]

The SMPS1200A700 voltage is too high for the 1ET7040SA. So we use the SMPS1200A400.
There are off the shelf SMPS allowing to get a bit more power out of the 1ET7040SA (around 1 dB extra headroom) but after careful analysis we chose not to use them.

 

[Stereoed]

Hi Fred,
thanks for your post. 1 dB extra headroom is not so much.

 

[thegeton]

Received my boXem audio A Series 4216/E2 on 3/7.

Installed it in this system: Bluesound Node 2i - miniDSP SHD - boXem audio 4216/E2 - Revel Concerta2 F36 - SVS SB-3000 Sub

Transparent, powerful, barely warm when running at ~85 dB for 30-40 minutes.

Couldn't be happier.

 

[boXem]

Small revision on pricing for the A series. Some références increase but most decrease. Be it mono, stereo or multichannel, the quality/price ratio is very competitive.
In example, the A 4216/E2 (2x1ET6525SA) is sold for 1170 € VAT excl, which is one of the cheapest offerings in EU. I prefer not to compare to US offerings, the exchange rate and tariffs do not help us at this time.

 

[pogo]

A 4216/E2:
SNR at max power TBD
Output noise TBD

Why TBD?

 

[boXem]

Because the page was created before knowing the values and post #127.
But you are right, this should be updated.

 

[Graham849]

Amirm finds the A 4216/E2 an excellent piece of gear

'boXem A 4216/E2 Stereo Amplifier Review'

Aug 8, 2025

This is a review and detailed measurements of the boXem A 4216/E2 stereo balanced amplifier based on Purifi 1ET6525SA class D module. It was sent to me by the company and costs €1,160 (USD $1,350).

While not built out of billet of aluminum and such, the 4216/E2 still manages to look unique and attractive. The case is plenty big and airy and in use did not even rise above the room temperature. The protection circuit is very robust and did not care how many times and how much I pushed it into clipping. It would keep going without shutting down.

Was happy to see trigger...

• amirm
• Replies: 282
• Forum: Stereo and Multichannel Amplifier Reviews

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